結果

問題 No.120 傾向と対策：門松列（その１）
コンテスト
ユーザー neko_the_shadow
提出日時 2020-03-06 16:35:40
言語 Go
(1.23.4)
結果
AC  
実行時間 53 ms / 5,000 ms
コード長 3,590 bytes
コンパイル時間 14,736 ms
コンパイル使用メモリ 239,824 KB
実行使用メモリ 6,400 KB
最終ジャッジ日時 2024-10-14 02:54:33
合計ジャッジ時間 12,643 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge5
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ファイルパターン 結果
other AC * 4
権限があれば一括ダウンロードができます

ソースコード

diff # 

package main

import (
	"bufio"
	"fmt"
	"math"
	"os"
	"strconv"
	"strings"
)

func exec(stdin *Stdin, stdout *Stdout) {
	t := stdin.ReadInt()
	for i := 0; i < t; i++ {
		n := stdin.ReadInt()
		c := NewCounter()
		for j := 0; j < n; j++ {
			c.Increment(stdin.ReadInt())
		}

		q := NewHeapq()
		for _, key := range c.Keys() {
			q.Push(c.Get(key)*-1, c.Get(key))
		}

		ans := 0
		for q.Size() > 2 {
			x, _ := q.Pop().(int)
			y, _ := q.Pop().(int)
			z, _ := q.Pop().(int)
			ans++
			x--
			y--
			z--
			if x > 0 {
				q.Push(-x, x)
			}
			if y > 0 {
				q.Push(-y, y)
			}
			if z > 0 {
				q.Push(-z, z)
			}
		}
		stdout.Println(ans)
	}
}

func main() {
	stdout := NewStdout()
	defer stdout.Flush()
	exec(NewStdin(bufio.ScanWords), stdout)
}

type Stdin struct {
	stdin *bufio.Scanner
}

func NewStdin(split bufio.SplitFunc) *Stdin {
	s := Stdin{bufio.NewScanner(os.Stdin)}
	s.stdin.Split(split)
	s.stdin.Buffer(make([]byte, bufio.MaxScanTokenSize), int(math.MaxInt32))
	return &s
}

func (s *Stdin) Read() string {
	s.stdin.Scan()
	return s.stdin.Text()
}

func (s *Stdin) ReadInt() int {
	n, _ := strconv.Atoi(s.Read())
	return n
}

func (s *Stdin) ReadFloat64() float64 {
	n, _ := strconv.ParseFloat(s.Read(), 64)
	return n
}

type Stdout struct {
	stdout *bufio.Writer
}

func NewStdout() *Stdout {
	return &Stdout{bufio.NewWriter(os.Stdout)}
}

func (s *Stdout) Flush() {
	s.stdout.Flush()
}

func (s *Stdout) Println(a ...interface{}) {
	fmt.Fprintln(s.stdout, a...)
}

type Heapq struct {
	elements []*element
}

type element struct {
	x int
	v interface{}
}

func NewHeapq() *Heapq {
	return &Heapq{elements: []*element{nil}}
}

func (heapq *Heapq) Push(x int, v interface{}) {
	heapq.elements = append(heapq.elements, &element{x: x, v: v})
	n := len(heapq.elements) - 1
	for n > 1 {
		if heapq.elements[n/2].x < heapq.elements[n].x {
			break
		}
		heapq.elements[n/2], heapq.elements[n] = heapq.elements[n], heapq.elements[n/2]
		n /= 2
	}
}

func (heapq *Heapq) Pop() interface{} {
	head := heapq.elements[1].v
	heapq.elements[1] = heapq.elements[len(heapq.elements)-1]
	heapq.elements = heapq.elements[:len(heapq.elements)-1]

	n := 1
	for n < len(heapq.elements) {
		if n*2 >= len(heapq.elements) {
			break
		}

		var m int
		if n*2+1 >= len(heapq.elements) {
			m = n * 2
		} else {
			if heapq.elements[n*2].x < heapq.elements[n*2+1].x {
				m = n * 2
			} else {
				m = n*2 + 1
			}
		}

		if heapq.elements[n].x < heapq.elements[m].x {
			break
		}
		heapq.elements[n], heapq.elements[m] = heapq.elements[m], heapq.elements[n]
		n = m
	}

	return head
}

func (heapq *Heapq) isEmpty() bool {
	return len(heapq.elements) == 1
}

func (heapq *Heapq) Size() int {
	return len(heapq.elements) - 1
}

func (heapq *Heapq) String() string {
	s := make([]string, len(heapq.elements)-1)
	for i := 1; i < len(heapq.elements); i++ {
		s[i-1] = fmt.Sprintf("%v", heapq.elements[i].v)
	}
	return strings.Join(s, " ")
}

type Counter map[interface{}]int

func NewCounter() *Counter {
	return &Counter{}
}

func (c *Counter) put(key interface{}, v int) {
	d := map[interface{}]int(*c)
	d[key] = v
}

func (c *Counter) Increment(key interface{}) {
	c.put(key, c.Get(key)+1)
}

func (c *Counter) Decrement(key interface{}) {
	v := c.Get(key)
	if v > 0 {
		c.put(key, v-1)
	}
}

func (c *Counter) Get(key interface{}) int {
	d := map[interface{}]int(*c)
	if v, ok := d[key]; ok {
		return v
	} else {
		return 0
	}
}

func (c *Counter) Keys() []interface{} {
	d := map[interface{}]int(*c)
	keys := []interface{}{}
	for key := range d {
		keys = append(keys, key)
	}
	return keys
}
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